use proxy for comfyui

[lamia-zamia]

Currently, image generation fails when accessing SillyTavern remotely if ComfyUI is only listening on localhost. This happens because some requests are sent directly from the browser, where localhost refers to the remote device rather than the SillyTavern host.

This PR routes all ComfyUI requests through the SillyTavern server.

Changes:

• Route main image generation through SillyTavern’s server-side ComfyUI endpoint.
• Use the same server-side endpoint for NPC portrait generation.
• Load the LoRA list through SillyTavern’s /proxy route.
• Remove all direct browser requests to ComfyUI.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[Arif-salah]

will look into it